Ecommerce and ERP integration checklist for growing businesses

1. Define the system of record

Choose which system owns each business entity and which systems may update it. Without ownership, two-way sync can create loops, stale overwrites and support disputes.

2. Map every flow as a contract

For each entity, document direction, trigger, expected latency, validation, duplicate protection, failure owner and reconciliation. “Real time” should be used only where the business consequence justifies it.

• Product and catalogue changes may be event-driven or scheduled.
• Inventory availability often needs low latency but still requires reconciliation.
• Order acceptance should return a clear outcome to the storefront.
• Finance and settlement may run in controlled batches with totals.
• Analytics copies should never become accidental operational sources.

Use stable identifiers across systems. Names, email addresses and display labels are poor primary keys.

3. Model the full order lifecycle

The happy path—paid, packed and delivered—is only one state sequence. Define behaviour for:

• payment authorised but ERP order creation delayed;
• partial allocation or fulfilment across warehouses;
• address, quantity or item changes after placement;
• cancellation before and after warehouse release;
• failed, returned or refused delivery;
• partial and full returns;
• replacement orders and exchanges;
• partial refunds, fees and settlement differences; and
• B2B credit, approval or purchase-order flows.

Make state transitions explicit. A free-text status copied between systems is difficult to validate and reconcile.

Inventory reservation

Define when stock is reserved, how long the reservation lasts and what releases it. Clarify whether the storefront displays on-hand, available-to-promise or a calculated serviceability result. Multi-warehouse and marketplace sales require a rule for competing demand.

Fulfilment and courier operations

Map warehouse allocation, pick/pack events, label generation, courier selection, manifesting, tracking and delivery exceptions. RadXsoft’s confirmed work with Prozo included delivery technology supporting store, pack and ship operations, pan-India warehousing and more than 30 courier partners; the useful lesson is that fulfilment control spans several operational systems rather than one shipment API.

4. Engineer for failure and recovery

External systems will be slow or unavailable. Networks will retry requests. Operators will correct records. Reliability comes from making these conditions visible and recoverable.

• Use idempotency keys for order and payment-related commands.
• Store correlation identifiers across systems.
• Retry only errors that may succeed later, with limits and backoff.
• Route permanent failures to an exception queue with an owner.
• Preserve the original payload and validation result needed for investigation.
• Provide replay tools that cannot create duplicates.
• Reconcile business totals, states and missing records on a schedule.

An integration dashboard should answer what failed, what the customer experienced, who owns recovery and whether financial or inventory exposure exists.

5. Protect credentials and customer data

• Use separate credentials and least privilege for each integration.
• Store secrets outside source code and rotate them safely.
• Authenticate inbound webhooks and protect against replay.
• Encrypt sensitive data in transit and according to storage requirements.
• Move only the personal data each destination needs.
• Define retention for payloads, logs and error records.
• Audit manual corrections and sensitive operational actions.

Do not place full payment details into general integration logs. Use the payment provider’s supported tokens and references.

6. Test business behaviour, not only connectivity

A successful API call does not prove the operation is correct. Build scenarios around real workflows and failure modes.

1. Contract tests: required fields, formats, enumerations and version compatibility.
2. Lifecycle tests: order, cancellation, fulfilment, return and refund transitions.
3. Volume tests: campaign peaks, bulk catalogue updates, warehouse waves and backlog recovery.
4. Failure tests: timeouts, duplicate events, late delivery and partial downstream availability.
5. Reconciliation tests: inventory, order totals, payments, refunds and settlement.
6. Operational tests: exception visibility, manual recovery, auditability and support handover.

Integration mapping worksheet

Roll out in controlled stages

Start with representative products, warehouses and order types. Run reconciliation before expanding volume. Keep rollback and manual continuity procedures until the integration has operated through normal and peak conditions.